The Fauna of Bottomland Hardwoods in Southeastern United States

Wharton, Charles H.; Lambour, Victor W.; Newsom, John D.; Winger, Parley V.; Gaddy, L. L.; Mancke, Rudy

doi:10.1016/b978-0-444-42020-6.50012-3

Cited by 38 publications

(11 citation statements)

References 22 publications

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“…In addition to high flows, periods of low flows are equally important for algae control, water quality maintenance and the use of the river by local people [16]. Low flows can also provide recruitment opportunities for riparian plant species in frequently inundated floodplains [17].…”

Section: Introductionmentioning

confidence: 99%

Impact of the Farakka Dam on Thresholds of the Hydrologic Flow Regime in the Lower Ganges River Basin (Bangladesh)

Gain

Giupponi

2014

Water

102

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Abstract:The variation of river flow within a natural range plays an important role in promoting the social-ecological sustainability of a river basin. In order to determine the extent of the natural range of variation, this study assesses hydrologic flow thresholds for the Lower Ganges River Basin. The flow threshold was calculated using twenty-two "Range of Variability (RVA)" parameters. The impact of Farakka Dam on the Lower Ganges River flow was calculated by comparing threshold parameters for the pre-Farakka period (from 1934 to 1974) and the post-Farakka period . The results demonstrate that due to water diversion by the Farakka Dam, various threshold parameters, including the monthly mean of the dry season (December-May) and yearly minimum flows, have been altered significantly. The ecological consequences of such hydrologic alterations include the destruction of the breeding and raising grounds for a number of Gangetic species, the increase of salinity in the southwest coastal region of Bangladesh and a reduction of fish and agricultural diversity. The major findings in this paper have a number of policy-level implications to aid water sharing mechanisms and agreements between the government of Bangladesh and India. The methodological approach presented in this study is applicable to other river basins.

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Section: Introductionmentioning

confidence: 99%

Impact of the Farakka Dam on Thresholds of the Hydrologic Flow Regime in the Lower Ganges River Basin (Bangladesh)

Gain

Giupponi

2014

Water

102

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“…The last is particularly important, possibly accounting for a reduced invertebrate fauna on lowland bogs in Britain compared with wetlands at higher altitudes (Coulson, 1992). Wharton et al (1981) noted that the flora and fauna may occupy distinct zones which have little relationship to geomorphology. In contrast to undisturbed lowland raised bogs, therefore, which have a generally simple hydrology, floodplain wetlands are characterized by highly variable spatial and temporal variations in water content which are likely to exert an impact upon the range of fauna in particular wetlands.…”

Section: Wetland Hydroecologymentioning

confidence: 99%

The hydrological basis for conservation of floodplain wetlands: implications of work at Narborough Bog, UK

Bradley

1997

Aquatic Conserv: Mar. Freshw. Ecosyst.

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1. Increasing concern for the environmental consequences of wetland loss has yet to be reflected in a wider application of hydrological techniques for their preservation. This paper looks at the specific example of floodplain wetlands by first considering how local hydrogeomorphological conditions may explain varied wetland occurrence. The effects of variations in individual hydrological fluxes are identified and the ability of standard hydrological monitoring programmes to represent these processes is considered.2. These concepts are illustrated with reference to work on Narborough Bog, a small floodplain wetland in the UK. The characteristics of the wetland are outlined to illustrate how this determined the design of a monitoring programme investigating wetland hydrology and the practicalities of conservation. Measurements of water-table height were completed using a network of 30 piezometers located in the wetland and with additional measurements of river stage and meteorological variables.3. The results of this data collection programme over the period 1991±1993 are described. The value of the data in characterizing the hydrology of the wetland is assessed and the need for sustained monitoring of variations in wetland water storage and flux is emphasized. The implications of the results for future wetland monitoring programmes are identified.4. Hydrological data collected in this way can be used to develop a wetland mathematical model. This may be achieved by aggregating wetland sedimentological characteristics and by modelling specific periods of precipitation and evapotranspiration to determine the validity of the modelling process. Current shortcomings in the modelling process are discussed; however, wider application of this technique might help direct informed conservation of floodplain wetland landforms through improved understanding of the balance between internal and external water fluxes and their interrelationships. Similarly, models enable evaluation of the impacts of future catchment changes on wetlands.

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“…High flows maintain ecosystem productivity and diversity (Poff et al, 1997). Periods of low flow allow for recruitment of riparian plant species where floodplains are frequently inundated (Wharton et al, 1981). The duration of a specific flow condition often determines its ecological significance.…”

Section: Introductionmentioning

confidence: 99%

Measuring and evaluating ecological flows from streams to regions: Steps towards national coverage

2018

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Living aquatic communities are largely determined and maintained by the volume and quality of flowing waters, both within lotic systems and in receiving waters of coastal systems. However, flow is one of the most frequently and extensively altered features of rivers and streams; alteration effects are likely to be exacerbated by climate change. Lotic systems vary and different fish species need different environmental conditions, and distinct problems are evident at various spatial scales. New synoptic flow and biological information now make it possible to evaluate the effects of altered flows throughout the Great Lakes Region at scales from the stream reach to the Region. We used estimates of river and streamflow and observed fish abundances to develop tools that specify the response of fish to alterations in those flows. We fit the logistic model to a cumulative fish abundance curve as a function of yield providing an empirical means to develop models of the response of cumulative fish abundance to flows. Response zones of yield for each species in each system type (based on size and thermal class) illustrate how criteria may be developed that can be used in decision‐making for management of flows. In our example application, we evaluate both the general response of brook trout (Salvelinus fontinalis) abundances (and fish diversity) to changes in flows and assess the sensitivity of each stream fish community to flow alteration. Mapping stream sensitivity to flow alteration throughout the US Great Lakes Region with a multiscale spatial framework showed how regional variability in sensitivity for any fish species or assemblage may be evaluated and provides managers with information to help determine where the best opportunities for protection or restoration of streamflows and associated communities exist. These results provide valuable tools and critical information to managers responsible for balancing water uses and maintaining high quality lotic ecosystems. These methods may be applied to any geographic region and can be extended nationally or globally, where flow, temperature, fish and landscape data are available.

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The Fauna of Bottomland Hardwoods in Southeastern United States

Cited by 38 publications

References 22 publications

Impact of the Farakka Dam on Thresholds of the Hydrologic Flow Regime in the Lower Ganges River Basin (Bangladesh)

Impact of the Farakka Dam on Thresholds of the Hydrologic Flow Regime in the Lower Ganges River Basin (Bangladesh)

The hydrological basis for conservation of floodplain wetlands: implications of work at Narborough Bog, UK

Measuring and evaluating ecological flows from streams to regions: Steps towards national coverage

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